This is how to set it up:goto Control Panel ┬╗ Primary SettingsSelect the logging tab.Log MySQL Errors? Enable thisMySQL Error Log Storage Directory: enter a path if it is missing to a valid location. It will be like the Absolute PATH to Main Directory: from the Control Panel ┬╗ DB, Paths & URLs

Then click on the click to test directory link.If all is set you will get Test passed. Also it will write a file called like testfile.